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babelfish-xj-or-jx-or-whatever


Zen Mod

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Pa i ne treba USB ulaz. Dovoljno je da preko trafoa i onih silnih kondenzatora polozi jedan valjani USB kabel, sigurno ce popraviti zvuk. Uz korekciju polozaja bi se sigurno doslo do idealne zvucne slike. 

 

Salu na stranu, ovo zaista izgleda vrhunski. 

Ako moze neki hint koja je fora sa tolikim brojem kondenzatora. Versus dva tri velika...

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Now , few words about THD spectra shaping ;

Papa taught us during the years several tricks how to imbalance that perfect Symmetry (ironic , isn’t it …… working principle of amp itself is called Supersymmetry/SUSY , while we are trying to spoil it :)  .

Anyway , we want some sugar , and we are getting that with 2nd harmonic above 3rd ; again – Papa’s Lectures – some people prefer that way (Tubelovers?) , while some people prefer dominance of 3rd (Sandworshippers?).

Further – we can divide both of these groups by polarity of dominant harmonic- some prefer negative , some prefer positive.

What can I do regarding that , except to find how (hardly first one knowing that) and then organize easiest way of doing it ……..

If you take a look at LTSpice schematic of amp (third pic from top) , you can see two resistor positions circled in red. These resistors are path to modulation of Aleph CCS-es and their values are directly defining amount of that modulation , thus defining amount of Aleph CCS-es contribution in output signal .

So , simple ; disclaimer – my goal is to invoke 2nd , and control it’s polarity and amount :

-If these two resistors are same in value , there is greatest amount od symmetry , resulting in zilch 2rd ,dominant 3rd.

-If we increase value of said resistor at side of positive output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being negative phase,

-If we increase value of said resistor at side of negative output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being positive phase.

That’s it .

How it is organized in vivo ?

I had idea to introduce sort of already know device among Greedy Boys , called -ZAP (Zen Amount Pot) , but later decided that would be impractical , and probably leading to constant play with , while forgetting enjoyment in music :)

…. so I decided to use pin sockets/or whatever their name is , in said resistor positions , thus allowing easy change of resistors in situ , without involving soldering equipment etc.pin-sockets-300x225.jpg

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Now , if you take a look at Eagle front End schematic and Eagle Front End pcb screenshot (4th and 5th pics from top) said resistor positions are R3 and R53 , with R3 being position of our special interest :

 

My taste dictate R53 being 1K , and R3 being 1K2 ; for anyone else’s taste , all what’s needed are few different resistor values and pincette/tweezers ; just power amp off , pull resistors out (gently,please) and push new one in (gently again , please).

After that you can power amp on , or go out for beer and some talk , I don’t care

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Few more pics , with lid on , and even with USB stick as size reference thingie:

 

 

Some technical stuff:

-Donuts : I ordered 900VA made on 1K2VA cores ; later -when actual winder guy itself  contacted me to confirm few things , he said – do not worry , it’ll be 0.9T … they’re having static shield and outer tape shield .

-Bridges are Big.

-Each rail filter consisting of 90mF-0R11-90mF , resulting in 23V5dc.

-Iq smidge above 7A , resulting in 100W/8R , 80W/4R , Winter blessing being in range of 360W per box.

-Relative offset wandering some 25-30mV from stone cold to hysterically warm (top of sinks being 17C above ambient).

-Absolute offset frozen around -350mV , right from powering up , all the way to hysterically warm.

-Iq change around -4% , from stone cold to hysterically warm.

-No power on thump , while power off thump is no more than small plop , even on my LC1B , they being sensitive on air flow induced by cat crossing next yard ……

-Weight – smidge above 60kg.

And yes – there is additional pair of drek binding posts at back , accepting any Remote Power On/Off voltage from 10 to 35Vdc, polarity irrelevant.

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I forgot to write SuperSymmetry/SUSY anywhere on pcbs , but I didn’t forgot what’s more important:

 

IMG_6738-e1517680055937-300x165.jpg

 

 

Did I said that they’re Gorgeously sounding ?

 

tworats.gif

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plan, način izrade, pedanterija za najsitniji detalj ... (ne volim A class jer skupo za moje gedžave uši) ali

ovo je prelepo pogotovo cajgeri... mislim, šetanije armonika po želji :crazyrocker:

uglavnom sta reći koju posluku porati... 

Zen, da si živ i zdrav i da napraviš još brdo ovaki skalamerija :BeerMugCheers:

 

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ovo dosad se sve odnosilo na iteraciju sa 10 mosfeta po kvadrantu , tzv. 10-deep

 

to znaci jedna velika pcb za dva kvadranta , za sva cetiri trebaju dve pcb , svaka ide na jedan bok , dakle dve kutije za stereo = monoblok pristup

 

evo i iteracije za manji amp , gde ide jedna pokazana OS pcb po kanalu , dakle 5 mofeta po kvadrantu = 5-deep

 

jedna pcb po kanalu , dakle moguce je u jedno vece kuciste strpati stereo amp

 

podrazumeva se prilagodjenje source otpornika i optimizacija mirne struje ...

 

Babelfish-XJ-FE-5-deep.jpg

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49 minutes ago, Zen Mod said:

ovo dosad se sve odnosilo na iteraciju sa 10 mosfeta po kvadrantu , tzv. 10-deep

 

to znaci jedna velika pcb za dva kvadranta , za sva cetiri trebaju dve pcb , svaka ide na jedan bok , dakle dve kutije za stereo = monoblok pristup

 

evo i iteracije za manji amp , gde ide jedna pokazana OS pcb po kanalu , dakle 5 mofeta po kvadrantu = 5-deep

 

jedna pcb po kanalu , dakle moguce je u jedno vece kuciste strpati stereo amp

 

podrazumeva se prilagodjenje source otpornika i optimizacija mirne struje ...

 

Babelfish-XJ-FE-5-deep.jpg

optimizovano, mirna struja...o kojoj W disipaciji se prica, okvirno po kanalu?

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koliko god hladnjaci mogu da podnesu

 

recimo da je 20-ak Vdc za rails sasvim dovoljno  jer je bridged pa dobijas duplu amplitudu , al' zato moras nabrijavati Iq

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mislim ce napravi malu okruglu metalnu vinjetu i zalepi na kruzic na metru

malo , lepo

 

a nazad na amp ce dodje vec neka nalepnica sa natpisom , pravi font :)

 

edit: kad covek zna znanje , pa postavlja pitanja iz struke :cheers:

 

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